Power Suppliers are Increasing Demands on Steel Grade P91 or X10CrMoVNb9-1

Economic pressure is forcing power plant operators to increase their effectiveness by increasing temperature and steam pressure to provide energy at the lowest prices possible.

For current power stations, the characteristic steam temperature at the turbine intake is between 540°C - 565°C, although in the last few years, there has been an increase of the working medium to go above 565°C. In some cases, the water vapour is used with a temperature of up to 600°C. In the case of using the steam in the state of supercritical parameters (610°C/30MPa), compared to the current water vapour parameters (540°C/18MPa) it is possible to achieve an increase of effectiveness of energy devices by up to 8% at the current decrease of CO2 emissions by up to 20%.

Železiarne Podbrezová is adapting to the requirements of the segment. Today it is offering its customers seamless tubes destined for the critical parameters of above 600°C usage. This is provided by the steel grade P91 and T91 or X10CrMoVNb9-1 and corresponding equivalents.

P91 grade - key factors

P91 grade is ferrite-martensitic steel (9% chromium, 1% molybdenum) microalloyed with vanadium, niobium and with controlled content of nitrogen. Tubes made out of P91 grade are destined for boiler superheaters, power plant tube heaters, headers and duct pipes for high-temperature applications, and eventually for furnace ductwork in petrochemical assembly.

Železiarne Podbrezová is the leading manufacturer of seamless tubes and pipes to be used in boiler production, especially in Central Europe but also worldwide. Two production plants (in Slovakia and Spain) are served by the steel from its own production.

Dimension range:

OD (outside diameter) from 12.7mm to 139.7mm

WT (wall thickness) from 0.89mm to 12.50mm

Tubes made up to 21.3mm diameter are produced by the cold drawing process